I have one Razer Imperator on a Destructor pad (Laptop)

For the Desktop I have another Imperator thats on a Roccat Alumic (Awesome pad. It has dual surfaces and the difference is noticeable. Tracking is great for both my Imperator and TT Theron.

Lastly is my current favorite - the Thermaltake Theron. When that's not on the Alumic, I use a Razer Goliathaus. For a Cloth pad, it tracks great as well. I need a small pad to fit on the 'keyboard stand' of my sim cockpit and this fit the bill perfectly.